(Sorry I can't get the lines to line up correctly... but the font is not allowing it. Think of the Q and R as being located OVER the lines running vertically.)

Now, I can connect one leg wiring of a key to the location BR, and have that location when connected to Ground send the keypress "1". I can then connect a wire to location BQ and have it send the keypress "2".

You'll notice that the circuit for the B line already has TWO possible keys that it can send. These kinds of circuits are prone to what is called ""ghosting"....sending keypresses that aren't intended.

A better approach is to have discrete inputs for such work.... but it is more expensive because of the added complexity of doing so.

best,

....................john

andarlite

09-23-2007, 06:22 PM

This device has 6 X inputs and 6 Y inputs. That means you can connect 36 switches to it..... on the web page you provided take a look at the diagram on the right which shows the switch matrix and how the switches are connected together. Because 4 of the switches are reserve for the Hat switch, that leaves you a possible 32 switches.